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CONTA COSTA COUNTY (BCN) — Four dead birds were found infected with the West Nile virus in Contra Costa County, officials with the Contra Costa Mosquito & Vector Control District said Friday.

Three birds were found in Walnut Creek and one was found in Concord.

The district’s scientific program manager Steve Schutz said in a statement that the falling overnight temperatures are good for mosquito control. But rain and rising temperatures over the next week means residents still have to be vigilant.

Mosquito control officials urge residents to dump standing water; use mosquito repellents with DEET, picaridin, or oil of lemon eucalyptus; maintain swimming pools and avoid being outdoors at dawn or dusk when mosquitoes are most active.